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Retrograde Personal Semantic Memory During Post-Traumatic Amnesia and Following Emergence

Published online by Cambridge University Press:  10 September 2018

Caroline M. Roberts*
Affiliation:
Monash Institute of Cognitive and Clinical Neurosciences, School of Psychological Sciences, Monash University, Melbourne, Australia Monash-Epworth Rehabilitation Research Centre, Melbourne, Australia
Gershon Spitz
Affiliation:
Monash Institute of Cognitive and Clinical Neurosciences, School of Psychological Sciences, Monash University, Melbourne, Australia Monash-Epworth Rehabilitation Research Centre, Melbourne, Australia
Matthew Mundy
Affiliation:
Monash Institute of Cognitive and Clinical Neurosciences, School of Psychological Sciences, Monash University, Melbourne, Australia
Jennie L. Ponsford
Affiliation:
Monash Institute of Cognitive and Clinical Neurosciences, School of Psychological Sciences, Monash University, Melbourne, Australia Monash-Epworth Rehabilitation Research Centre, Melbourne, Australia Epworth Healthcare, Melbourne, Australia
*
Correspondence and reprint requests to: Caroline Roberts, Monash-Epworth Rehabilitation Research Centre, 185-187 Hoddle Street, Richmond, VIC, Australia 3121. E-mail: [email protected].

Abstract

Objectives: Anecdotal reports suggest that following traumatic brain injury (TBI) retrograde memories are initially impaired and recover in order of remoteness. However, there has been limited empirical research investigating whether a negative gradient in retrograde amnesia—relative preservation of remote over recent memory—exists during post-traumatic amnesia (PTA) compared with the acute phase post-emergence. This study used a repeated-measures design to examine the pattern of personal semantic (PS) memory performance during PTA and within two weeks of emergence to improve understanding of the nature of the memory deficit during PTA and its relationship with recovery. Methods: Twenty patients with moderate-severe TBI and 20 healthy controls (HCs) were administered the Personal Semantic Schedule of the Autobiographical Memory Interview. The TBI group was assessed once during PTA and post-emergence. Analysis of variance was used to compare the gradient across lifetime periods during PTA relative to post-emergence, and between groups. Results: PS memory was significantly lower during PTA than post-emergence from PTA, with no relative preservation of remote memories. The TBI group was still impaired relative to HCs following emergence from PTA. Lower overall PS memory scores during PTA were associated with increased days to emerge from PTA post-interview. Conclusions: These results suggest a global impairment in PS memory across lifetime periods particularly during PTA, but still present within 2 weeks of emergence from PTA. PS memory performance may be sensitive to the diffuse nature of TBI and may, therefore, function as a clinically valuable indicator of the likely time to emerge from PTA. (JINS, 2018, 24, 1064–1072)

Type
Regular Research
Copyright
Copyright © The International Neuropsychological Society 2018 

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